CONTENTS. 



Page 



Art. XXVI. — Lime-Silica Series of Minerals ; by A. L. Day 

 and E. S. Shepherd, with Optical Study by F. E. 

 Wright ___> 265 



XXVII. — Analysis of "Iron Shale" from Coon Mountain, 



Arizona ; by O. C. Farrington '. . - 303 



XXVIII. — Phenomena Observed in Crookes' Tubes; by N. 



T. Bacon _ ___: 310 



XXIX. — Northward Extension of the Atlantic Preglacial 



Deposits ; by I. Bowman 313 



XXX. — A Delicate Color Reaction for Copper, and a Micro- 

 chemical Test for Zinc ; by H. C. Bradley 326 



XXXI. — Elimination and Alkalimetric Estimation of Silicon 



Fluoride in the Analysis of Fluorides; by A. Hileman 329 



XXXII. — Note on the Actual Drop of Pressure in the Fog 



Chamber ; by C. Barus . 339 



XXXIII. — New Method for Standardizing the Coronas of 



Cloudy Condensation ; by C. Barus 342 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Barium Sub-oxide and the Preparation of Metallic 

 Barium, Gtjntz : Thermal Formation of Nitric Oxide and Ozone in Moving 

 Gases, F. Fischer and H. Marx : Action upon Carbon of Oxygen, Carbon 

 -Dioxide and Steam, P. Farup, 344. — Combustion of Halogen Compounds, 

 C. J. Robinson : Introduction to General Inorganic Chemistry, A. Smith : 

 A 'First Course in Physics, R. A. Millikan and H. G. Gale, 345. — Labora- 

 tory Course in Physics for Secondary Schools, R. A. Millikan and H. G. 

 Gale : Outlines of the Evolution of Weights and Measures and the Metric 

 System, W. Hallock and H. T. Wade, 346. 



Geology — United States Geological Survey, 346. — Geologic Map of the Buf- 

 falo Quadrangle, D. D. Luther, 347. — Second Report of the Director of 

 the Science Division, 1905 : Upper Ordovician Rocks of Kentucky and 

 their Bryozoa, J. M. Nickles : Chazy Formation and its Fauna, P. E. 

 Raymond, 348. — New American Cybele. J. E. Narraway and P. E. 

 Raymond : Ueber Phylogenie der Arthropoden, A. Handlirsch : Die Ent - 

 wickelung von Indoceras baluchistanenense Noetling. Ein Beitrag zur 

 Ontogenie der Ammoniten, F. Noetling, 349. — Untersuchungen iiber die 

 Familie Lyttoniidae Waag. emend. Noetling, F. Noetling, 350. 



Miscellaneous Scientific Intelligence — Les Prix Nobel en 1903, 351. — British 

 Association : Carnegie Institution of Washington, 352. 



Obituary — W. B. Dwight : P. Drude : Sir W. L. Buller, 352. 



